Notes on the Geology of the Country around GouTburn. 69 



of Brachiopods, Cyrtia, Pentamerus, Ehynconella, and Orthis ; 

 also, the genera of corals Favosites and Stroinatopora. In 

 addition to these, at Windellama, the most prolific fossilliferous 

 spot on the east side of the county, the following genera were 

 procured: — Of corals, Heliolites, Cyathopkyllum, Acervularia, 

 Favosites polymorpha (?) • of brachiopods, Ehynconella, two 

 species : small Spirifer ; Atrypa reticularis, and another ; Leptgena 

 sericea ; Orthis ; A. gasteropod, Loxonema. 



On the western side, near Lake Bathurst, the following occur : 

 — The interesting Foraminifer, called Receptatulites Clarkei (or 

 Australis) ; of corals, Favosites Grothlandica, Lithostrotion, 

 Lithodendron (?), Cyathophyllum ; of Brachiopods, Spirifer, 

 Atrypa large, Strophomena, Strophodonta ; of Gasteropods, 

 Phanerotinus, and Loxonema ; of Lamellibranchs, Lucina, and 

 two species of Conocardium ; in addition to these, Orthoceras, 

 and crinoidal remains. 



The fossils found in the lower strata, viz., at Windellama, 

 Lumley Creek, and other parts in the east of the county, are 

 closely allied to Upper Silurian forms, but in the higher strata, 

 which occur to the westward, as near as Lake Bathurst, the 

 fossils make a nearer approach to carboniferous types. 



MINERALS. 



Brief allusion may be made to the minerals known to occur in 

 this county. As far as I know the only locality where gold has 

 been profitably extracted is the Shoalhaven basin ; quite 

 recently auriferous quartz reefs in the neighbourhood of Nerri- 

 munga Creek have been attracting attention. Specimens of 

 quartz containing gold have been found from the Boro Creek 

 junction downwards along the county's border. Quartz veins 

 are very common in many parts ; smoky crystals and large 

 masses of quartz are found lying loose on Goulburn Plains, 

 having probably been washed out of the schistose rocks in the 

 vicinity which contain nests and veins of this mineral. These 

 are considered to possess little or no auriferous value. Patches 

 of quartz are common in the granite along the Wollondilly. In 

 some places quartzites exhibit small cracks which have become 

 filled in with vein quartz. It appears as if solutions of silica had 

 percolated the whole series of rocks, depositing quartz in every 

 available crack and interstice, though probably at very distinct 

 epochs ; thus converting sandstones into quartzites, perhaps 

 assisting the formation of the flinty or hornstone rocks before 

 alluded to, and also forming nests and reefs of quartz, though 

 the origin of their auriferous character is a mystery. Copper 

 pyrites occurs at the mines at Currawang, the lode running W. 

 by N"., also below Boro Creek, at Lockyersleigh, and on the 

 Shoalhaven, east of Bungonia. The district to the east of Bun- 

 gonia is remarkable for the number of mineral species which it 



